On Tue, Dec 09, 2014 at 03:40:35PM +0800, Weijie Yang wrote: > If the free page and its buddy has different zone id, the current > zone->lock cann't prevent buddy page getting allocated, this could > trigger VM_BUG_ON_PAGE in a very tiny chance: >
Under what circumstances can a buddy page be allocated without the zone->lock? Any parallel allocation from that zone that takes place will be from the per-cpu allocator and should not be affected by this. Have you actually hit this race? -- Mel Gorman SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
